feat(worker): list every tag in the database

Query bar completion cannot offer tag names without a way to enumerate
them, and libnotmuch had no call wired up for it. Follows the existing
generation-counter pattern; the result crosses the thread boundary as a
QStringList.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/notmuchworker.h b/src/notmuchworker.h
index e0c80c6..88187ec 100644
--- a/src/notmuchworker.h
+++ b/src/notmuchworker.h
@@ -69,11 +69,17 @@ public slots:
                             const QStringList &remove,
                             const QString &description);
 
+    /// Every tag in the database, sorted. Feeds query bar completion, which
+    /// cannot offer tag names it has no way to enumerate. Called at startup,
+    /// after a sync, and after a tag mutation introduces an unknown tag.
+    void requestAllTags(quint64 generation);
+
 signals:
     void threadsReady(const QVector<ThreadSummary> &threads, quint64 generation);
     void queryFinished(int totalThreads, quint64 generation);
     void threadLoaded(const QVector<MessageRef> &messages, quint64 generation);
     void tagsApplied(const TagChange &change);
+    void allTagsReady(const QStringList &tags, quint64 generation);
     void errorOccurred(const QString &message);
 
 private: